<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>边框 border</title>
    <style>
        div{
            width: 300px;
            height: 300px;
            background-color: pink;
            /*border-radius: 2px 8px 8px 4px;*/
            /*border-radius: 50%;*/
            border: 5px solid orange;
            border-top-width: 15px;
            border-left-color: green;
            border-bottom: dotted;
            }
    </style>
</head>
<body>

</body>
</html>